[Long Lasting Battery] Built-in 700mAh battery, with low level, can be used up to 60 hours continuously after fully charged. With usb charge port, can be powered by laptop, mobile bank, adapter, etc. [Superior Design] With intelligent indicator lights screen, showing remaining battery and state of charge, releasing speed. One button operation. Ultra quiet (less than 5dB), so you can use it in the office or bedroom without worrying about your rest and work.
Notice: Can't use if you have a peacemaker.